Thank you I was running in Visual Studio with no console so the std 
error is suppressed.  I have fixed it so that I can see the std err.  
Add Linker Command Line /SUBSYSTEM:CONSOLE if anyone else has the 
problem.

Quoting Luca Abeni <[EMAIL PROTECTED]>:

> Jordan Dressman wrote:
>> Why is it I can open the MSMPEG4V3 codec when I use settings:
>> c->bit_rate = 10000000; //10 Mbps
>> c->time_base = {1,10};
>> c->gop_size = 10;
>> c->max_b_frames = 0;
>>
>> But I cannot open the codec when I change the max_b_frame to:
>> c->max_b_frames = 1;
>
> Probably because the MSMPEG4V3 does not support B frames... When you try
> to open the coded, you should see something like
> "[msmpeg4 @ 0x7ba1c0]b frames not supported by codec"
> printed on the standard error.
>
>
>                               Luca
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> libav-user mailing list
> [email protected]
> https://lists.mplayerhq.hu/mailman/listinfo/libav-user
>



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